Good article. It basically surmises everything that I have read so far.

My concern is that because our home is being built sometime after May (they start digging the lot in May), during the framing processes the osb sub floor would be exposed to lots of moisture... thus weakening the osb. Is this a valid concern or not?

Good article. It basically surmises everything that I have read so far.

My concern is that because our home is being built sometime after May (they start digging the lot in May), during the framing processes the osb sub floor would be exposed to lots of moisture... thus weakening the osb. Is this a valid concern or not?

The family has both options - it has made no difference afterwards or even during construction.

Before finish flooring high spots are ground off and low spots filled. OSB products have some water protection - wax on the surface and sealed end cuts.

Not a concern. If you want or need hardwood to run parallel to the joists, upgrade the thickness. This is also a good case for plywood - its less bendy than osb.

I feel the best reason is way down the road if you re-floor the home. The plywood will be in better shape after you pull the nails. For most, OSB is fine. We went plywood, but not sure it will ever be worth the extra cost. The builder will charge you way more than the extra cost of the material, because they can.